Inbred corn line G5205

ABSTRACT

Broadly this invention provides an invention which is an inbred corn line G5205. The methods for producing a corn plant by crossing the inbred line G5205 are also encompassed by the invention. Additionally, the invention relates to the various parts of inbred G5205 including culturable cells. This invention relates to hybrid corn seeds and plants produced by crossing the inbred line G5205 with at least one other corn line.

FIELD OF THE INVENTION

This invention is in the field of corn breeding, specifically relatingto an inbred corn line designated G5205. This invention also is in thefield of hybrid maize production employing the present inbred.

BACKGROUND OF THE INVENTION

The original maize plant was indigenous to the Western Hemisphere. Theplants were weedlike and only through the efforts of early breeders werecultivated crop species developed. The crop cultivated by earlybreeders, like the crop today, could be wind pollinated. The physicaltraits of maize are such that wind pollination results inself-pollination or cross-pollination between plants. Each plant has aseparate male and female flower that contributes to pollination, thetassel and ear, respectively. Natural pollination occurs when windtransfers pollen from tassel to the silks on the corn ears. This type ofpollination has contributed to the wide variation of maize varietiespresent in the Western Hemisphere.

The development of a planned breeding program for maize only occurred inthe last century. A large part of the development of the maize productinto a profitable agricultural crop was due to the work done by landgrant colleges. Originally, maize was an open pollinated variety havingheterogeneous genotypes. The maize farmer selected uniform ears from theyield of these genotypes and preserved them for planting the nextseason. The result was a field of maize plants that were segregating fora variety of traits. This type of maize selection led to, at most,incremental increases in seed yield.

Large increases in seed yield were due to the work done by land grantcolleges that resulted in the development of numerous hybrid cornvarieties in planned breeding programs. Hybrids were developed byselecting corn lines and selfing these lines for several generations todevelop homozygous pure inbred lines. One selected inbred line wascrossed with another selected inbred line to produce hybrid progeny(F1). The resulting hybrids, due to heterosis, are robust and vigorousplants. Inbreds on the other hand are mostly homozygous. Thishomozygosity renders the inbred lines less vigorous. Inbred seed can bedifficult to produce since the inbreeding process in corn linesdecreases the vigor. However, when two inbred lines are crossed, thehybrid plant evidences greatly increased vigor and seed yield comparedto open pollinated, segregating maize plants. An important consequenceof the homozygosity and the homogenity of the inbred maize lines is thatall hybrid seed produced from any cross of two such elite lines will bethe same hybrid seed and make the same hybrid plant. Thus the use ofinbreds makes hybrid seed which can be reproduced readily. The hybridplant in contrast does not produce hybrid seed that is readilyreproducible. The seed on a hybrid plant is segregating for traits.

The ultimate objective of the commercial maize seed companies is toproduce high yielding, agronomically sound plants that perform well incertain regions or areas of the Corn Belt. To produce these types ofhybrids, the companies must develop inbreds, which carry needed traitsinto the hybrid combination. Hybrids are not often uniformly adapted forthe entire Corn Belt, but most often are specifically adapted forregions of the Corn Belt. Northern regions of the Corn Belt requireshorter season hybrids than do southern regions of the Corn Belt.Hybrids that grow well in Colorado and Nebraska soils may not flourishin richer Illinois and Iowa soil. Thus, a variety of major agronomictraits are important in hybrid combination for the various Corn Beltregions, and have an impact on hybrid performance.

Inbred line development and hybrid testing have been emphasized in thepast half-century in commercial maize production as a means to increasehybrid performance. Inbred development is usually done by pedigreeselection. Pedigree selection can be selection in an F₂ populationproduced from a planned cross of two genotypes (often elite inbredlines), or selection of progeny of synthetic varieties, open pollinated,composite, or backcrossed populations. This type of selection iseffective for highly inheritable traits, but other traits, for example,yield requires replicated test crosses at a variety of stages foraccurate selection.

Maize breeders select for a variety of traits in inbreds that impacthybrid performance along with selecting for acceptable parental traits.Such traits include: yield potential in hybrid combination; dry down;maturity; grain moisture at harvest; greensnap; resistance to rootlodging; resistance to stalk lodging; grain quality; disease and insectresistance; ear and plant height. Additionally, Hybrid performance willdiffer in different soil types such as low levels of organic matter,clay, sand, black, high pH, low pH; or in different environments such aswet environments, drought environments, and no tillage conditions. Thesetraits appear to be governed by a complex genetic system that makesselection and breeding of an inbred line extremely difficult. Even if aninbred in hybrid combination has excellent yield (a desiredcharacteristic), it may not be useful because it fails to haveacceptable parental traits such as seed yield, seed size, pollenproduction, good silks, plant height, etc.

To illustrate the difficulty of breeding and developing inbred lines,the following example is given. Two inbreds compared for similarity of29 traits differed significantly for 18 traits between the two lines. If18 simply inherited single gene traits were polymorphic with genefrequencies of 0.5 in the parental lines, and assuming independentsegregation (as would essentially be the case if each trait resided on adifferent chromosome arm), then the specific combination of these traitsas embodied in an inbred would only be expected to become fixed at arate of one in 262,144 possible homozygous genetic combinations.Selection of the specific inbred combination is also influenced by thespecific selection environment on many of these 18 traits which makesthe probability of obtaining this one inbred even more remote. Inaddition, most traits in the corn genome are regrettably not singledominant genes but are multi-genetic with additive gene action notdominant gene action. Thus, the general procedure of producing a nonsegregating F₁ generation and self pollinating to produce a F₂generation that segregates for traits and selecting progeny with thevisual traits desired does not easily lead to a useful inbred. Greatcare and breeder expertise must be used in selection of breedingmaterial to continue to increase yield and the agronomics of inbreds andresultant commercial hybrids.

Certain regions of the Corn Belt have specific difficulties that otherregions may not have. Thus the hybrids developed from the inbreds haveto have traits that overcome or at least minimize these regional growingproblems. Examples of these problems include in the eastern corn beltGray Leaf Spot, in the north cool temperatures during seedlingemergence, in the Nebraska region CLN (corn Lethal necrosis and in thewest soil that has excessively high pH levels. The industry oftentargets inbreds that address these issues specifically forming nicheproducts. However, the aim of most large seed producers is to provide anumber of traits to each inbred so that the corresponding hybrid canuseful in a broader regions of the Corn Belt. The new biotechnologytechniques such as Microsatellites, RFLPs, RAPDs and the like haveprovided breeders with additional tools to accomplish these goals.

SUMMARY OF THE INVENTION

The present invention relates to an inbred corn line G5205.Specifically, this invention relates to plants and seeds of this line.Additionally, this relates to a method of producing from this inbred,hybrid seed corn and hybrid plants with seeds from such hybrid seed.More particularly, this invention relates to the unique combination oftraits that combine in corn line G5205.

Generally then, broadly the present invention includes an inbred cornseed designated G5205. This seed produces a corn plant.

The invention also includes the tissue culture of regenerable cells ofG5205 wherein the cells of the tissue culture regenerates plants capableof expressing the genotype of G5205. The tissue culture is selected fromthe group consisting of leaves, pollen, embryos, roots, root tips, guardcells, ovule, seeds, anthers, silk, flowers, kernels, ears, cobs, husksand stalks, cells and protoplasts thereof. The corn plant regeneratedfrom G5205 or any part thereof is included in the present invention. Thepresent invention includes regenerated corn plants that are capable ofexpressing G5205's genotype, phenotype or mutants or variants thereof.

The invention extends to hybrid seed produced by planting, inpollinating proximity which includes using preserved maize pollen asexplained in U.S. Pat. No. 5,596,838 to Greaves, seeds of corn inbredlines G5205 and another inbred line if preserved pollen is not used;cultivating corn plants resulting from said planting; preventing pollenproduction by the plants of one of the inbred lines if two are employed;allowing cross pollination to occur between said inbred lines; andharvesting seeds produced on plants of the selected inbred. The hybridseed produced by hybrid combination of plants of inbred corn seeddesignated G5205 and plants of another inbred line are apart of thepresent invention. This inventions scope covers hybrid plants and theplant parts including the grain and pollen grown from this hybrid seed.

The invention further includes a method of hybrid F1 production. A firstgeneration (F1) hybrid corn plant produced by the process of plantingseeds of corn inbred line G5205; cultivating corn plants resulting fromsaid planting; permitting pollen from another inbred line to crosspollinate inbred line G5205; harvesting seeds produced on plants of theinbred; and growing a harvested seed are part of the method of thisinvention.

Likewise included is a first generation (F1) hybrid corn plant producedby the process of planting seeds of corn inbred line G5205; cultivatingcorn plants resulting from said planting; permitting pollen from inbredline G5205 to cross pollinate another inbred line; harvesting seedsproduced on plants of the inbred; and growing a plant from such aharvested seed.

The inbred corn line G5205 and at least one transgenic gene adapted togive G5205 additional and/or altered phenotypic traits are within thescope of the invention. Such transgenes are usually associated withregulatory elements (promoters, enhancers, terminators and the like).Presently, trangenes provide the invention with traits such as insectresistance, herbicide resistance, disease resistance increased ordeceased starch or sugars or oils, increased or decreased life cycle orother altered trait.

The present invention includes inbred corn line G5205 and at least onetransgenic gene adapted to give G5205 modified starch traits.Furthermore this invention includes the inbred corn line G5205 and atleast one mutant gene adapted to give modified starch, acid or oiltraits. The present invention includes the inbred corn line G5205 and atleast one transgenic gene selected from the group consisting of:bacillus thuringiensis, the bar or pat gene encoding Phosphinothricinacetyl Transferase, Gdha gene, EPSP synthase gene, low phytic acidproducing gene, and zein. The inbred corn line G5205 and at least onetransgenic gene useful as a selectable marker or a screenable marker arecovered by the present invention.

A tissue culture of the regenerable cells of hybrid plants produced withuse of G5205 genetic material is covered by this invention. A tissueculture of the regenerable cells of the corn plant produced by themethod described above are also included.

DEFINITIONS

In the description and examples, which follow, a number of terms areused. In order to provide a clear and consistent understanding of thespecifications and claims, including the scope to be given such terms,the following definitions are provided.

BL MOIST

The moisture percentage of the grain at black layer, i.e., when 50% ofthe plants per plot have reached physiological maturity.

COLD GERM

Cold Germ is a measurement of seed germination under cold soilconditions. Data is reported as percent of seed germinating.

Color Traits

Anther color is yellow; if any other color is shown it is recorded asOther. Kernel Crown Color is white, yellow, orange; if any other coloris shown then the color is indicated as Other. Glume Ring Color islisted as Red/Purple; if any other color is shown or if the ring coloris inconsistent then Other/Absent is recorded. Brace Root Color islisted as Green, Reddish, Purplish; if any other color is shown or ifthe color is inconsistent then Other is recorded.ECBEuropean corn borer is a maize eating insect. ECBI is the first broodgeneration of European corn borers. ECB II is the second generation ofEuropean corn borers. ECBI is a rating of leaf damage. The ECB II (ECB2)rating is based upon tunneling. For all Entomology ratings, the highernumber is best (1=little or no resistance, 9=highly resistant). Thescale is slightly different for Ear Rating, which is taken on a 1-4basis. This is a rating of corn borer feeding on the ear. A 1 representsfeeding over the entire ear, while a 4 represents no observable feedingon the ear.EMERGE (EMG)The number of emerged plants per plot (planted at the same seedlingrate) collected when plants have two fully developed leaves.GIThis is a selection index that provides a single quantitative measure ofthe worth of a hybrid based on four traits. FI is a very similar indexwhich weights yield less than GI. In GI yield is the primary traitcontributing to index values. The GI value is calculated by combiningstalk lodging, root lodging, yield and dropped ears according to theattached mathematical formula:GI=100+0.5(YLD)−0.9(% STALK LODGE)−0.9(% ROOT LODGE)−2.7(% DROPPED EAR)GLSGray Leaf Spot (Cercospora Zeae) disease rating. This is rated on a 1-9scale with a “1” being very susceptible, and a “9” being veryresistant.*GWGross' Wilt (Corynebacterium nebraskense). This is rated on a 1-9 scalewith a “1” being very susceptible, and a “9” being very resistant.*HEATP10The number of Growing Degree Units (GDU's) or heat units required for aninbred line or hybrid to have approximately 10 percent of the plantsshedding pollen. This trait is measured from the time of planting.Growing Degree Units are calculated by the Barger Method where the GDU'sfor a 24 hour period are:

${G\; D\; U} = {\frac{\left( {{{Max}\mspace{14mu}{Temp}\mspace{14mu}\left( {{{^\circ}F}.} \right)} + {{Min}\mspace{14mu}{Temp}\mspace{14mu}\left( {{{^\circ}F}.} \right)}} \right)}{2} - 50}$The highest maximum temperature used is 86° F. and the lowest minimumtemperature used is 50° F. For each inbred or hybrid it takes a certainnumber of GDU's to reach various stages of plant development.HEATBLThe number of GDU's after planting when approximately 50 percent of theinbred or hybrid plants in a plot have grain that has reachedphysiological maturity (black layer).HEATPEEKThe number of GDU's after planting of an inbred when approximately 50percent of the plants show visible tassel extension.HEATP50 or HTP50The number of GDU's required for an inbred or hybrid to haveapproximately 50 percent of the plants shedding pollen. Growing DegreeUnits are calculated by the Barger Method as shown in the HEATP10definition.HEATP90The number of GDU's accumulated from planting when the last 100 percentof plants in an inbred or hybrid are still shedding enough viable pollenfor pollination to occur. Growing Degree Units are calculated by theBarger Method as shown in the HEATP10 definition.HEATS10The number of GDU's required for an inbred or hybrid to haveapproximately 10 percent of the plants with silk emergence of at least0.5 inches. Growing Degree Units are calculated by the Barger Method asshown in the HEATP10 definition.HEATS50 or HTS50The number of GDU's required for an inbred or hybrid to haveapproximately 50 percent of the plants with silk emergence of at least0.5 inches. Growing Degree Units are calculated by the Barger Method asshown in the HEATP10 definition.HEATS90The number of GDU's required for an inbred or hybrid to haveapproximately 90 percent of the plants with silk emergence of at least0.5 inches. Growing Degree Units are calculated by the Barger Method asshown in the HEATP10 definition.MDMV_(A)Maize Dwarf Mosaic Virus strain A. The corn is rated on a 1-9 scale witha “1” being very susceptible, and a “9” being very resistant.*MDMV_(B)Maize Dwarf Mosaic Virus strain B. This is rated on a 1-9 scale with a“1” being very susceptible and a “9” being very resistant.*MOISTUREThe average percentage grain moisture of an inbred or hybrid at harvesttime.NLBNorthern Leaf Blight (Exserohilum turcicum) disease rating. This israted on a 1-9 scale with a “1” being very susceptible, and a “9” beingvery resistant.*PCT TILLER or TILLER RATINGThe total number of tillers per plot divided by the total number ofplants per plot.PLANTThis term includes the entire plant and its plant cells, plantprotoplasts made from its cells, plant cell tissue cultures from whichcorn plants can be regenerated, plant calli, plant clumps, and plantcells that are intact in plants or parts of plants, such as embryos,pollen, flowers, kernels, ears, cobs, leaves, husks, stalks, roots, roottips, anthers, silk and the like, and this term also includes anymutated gene, transgenic DNA or (RNA) or portion thereof that have beenintroduced into the plant by whatever method.PLANT HEIGHT (PLTHT)(PHT)The distance in centimeters from ground level to the base of the tasselpeduncle.PLANT INTEGRITY (PLTINT) or (INT)The level of plant integrity on a scale of 1-9 with 9 evidencing thetrait most strongly: 1-2.9 ratings are low plant integrity, 3-5.9ratings are intermediate plant integrity, and 6-9 ratings are stronglyevidencing plant integrity.POPULATION (POP)The plant population.RMPredicted relative maturity based on the moisture percentage of thegrain at harvest. This rating is based on known set of checks andutilizes standard linear regression analyses and is referred to as theMinnesota Relative Maturity Rating System.SHEDThe volume of pollen shed by the male flower rated on a 1-5 scale wherea “1” is a very light pollen shedder, a “2.5” is a moderate shedder, anda “5” is a very heavy shedder.SLBSouthern Leaf Blight (Bipolaris maydis) disease rating. This is rated ona 1-9 scale with a “1” being very susceptible, and a “9” being veryresistant.*STAYGREEN(SGN)The level of staygreen of the plant on a scale of 1-9 with 9 evidencingthe trait most strongly: 1-2.9 ratings are low staygreen, 3-5.9 ratingsare intermediate staygreen, and 6-9 ratings are strongly evidencingstaygreen.TWTThe measure of the weight of grain in pounds for a one bushel volumeadjusted for percent grain moisture.VIGOR (VIG)Visual rating of 1 to 9 made 2-3 weeks post-emergence where a “1”indicates very poor early plant development, and a “9” indicatessuperior plant development.WARM GERMA measurement of seed germination under ideal (warm, moist) conditions.Data is reported as percent of seeds germinating.YIELD (YLD)Actual yield of grain at harvest adjusted to 15.5% moisture.Measurements are reported in bushels per acre.% DROPPED EARS (DE)The number of plants per plot, which dropped their primary ear, dividedby the total number of plants per plot.% ROOT LODGE (RL)Percentage of plants per plot leaning more that 30 degrees from verticaldivided by total plants per plot.% STALK LODGE (SL)Percentage of plants per plot with the stalk broken below the primaryear node divided by the total plants per plot.% CullPercentage of seed that passes through a 16/64 inch screen or will notpass through a 25/64 inch screen. *Resistant—on a scale of 1-9 with 9evidencing the trait most strongly: 1-2.9 ratings are susceptible, 3-5.9ratings are intermediate, and 6-9 ratings are resistant.

DETAILED DESCRIPTION OF THE INVENTION

G5205 has quick emergence and then shows average vigor for an inbred.The inbred is sensitive to Accent and very prone to root lodgingthroughout the season. The tassels seem to have aphids. The ears arelarge and well filled with some crooked rows and misplaced kernels.Yield is consistently above average. This inbred reaches black layerslowly so harvest should not be rushed.

The inbred has shown uniformity and stability within the limits ofenvironmental influence for all the traits as described in the VarietyDescription Information (Table 1) that follows.

The inbred has been self-pollinated for a sufficient number ofgenerations to give inbred uniformity. During plant selection in eachgeneration, the uniformity of plant type was selected to ensurehomozygosity and phenotypic stability. The line has been increased inisolated farmland environments with data on uniformity and agronomictraits being observed to assure uniformity and stability. No varianttraits have been observed or are expected in G5205.

The best method of producing the invention, G5205 which is substantiallyhomozygous, is by planting the seed of G5205 which is substantiallyhomozygous and self-pollinating or sib pollinating the resultant plantin an isolated environment, and harvesting the resultant seed.

TABLE 1 G5205 VARIETY DESCRIPTION INFORMATION #1 Type: Dent #2 RegionBest Adapted: When in hybrid combination the inbred usually has RM ofabout 115-120 days. #3 Plant Traits Plant Height 69 in. Ear Height 25in. Tillers (Rating) 5 Leaf Color Medium Green Brace Root Color GreenSilk Color Yellow/with color #4 Tassel Traits Glume Ring ColorOTHER/ABSENT Anther Color OTHER #5 Ear and Kernel Traits Cob Color REDKernel Crown Color YELLOW Kernel Body Color YELLOW #6 Disease ResistanceIn Inbred* Gross' Wilt = 3.0 Northern Leaf Blight = 3.3 Gray Leaf Spot =6.7 #7 Insect Resistance In Inbred ECB1 = 3.5 ECB2 = 2.7 Ear rate = 2.9*rating based on a 9-1 scale with a nine rating indicating mostresistance and 1 most susceptibility.

The comparable inbred to G5205 is comparable with G3601 which isdescribed in U.S. Pat. No. 6,849,790. Both inbred G3601 and G5205 wereformed with a common parent. Another comparable inbred is ZS0560, whichis a parent of G5205. This parent is described in U.S. Pat. No.5,585,533.

The data provided above is often a color. The Munsell code is areference book of color, which is known and used in the industry and bypersons with ordinary skill in the art of plant breeding.

The purity and homozygosity of inbred G5205 is constantly being trackedusing isozyme genotypes as shown in Table 2.

Isozyme Genotypes for G5205

Isozyme data were generated for inbred corn line G5205 according toprocedures known and published in the art. The data in Table 2 gives theelectrophoresis data on G5205.

TABLE 2 ELECTROPHORESIS RESULTS FOR G5205 Patent Code ACP1 ACP4 ADH MDH1MDH2 PGD1 PGD2 PHI PGM IDH2 G5205 33 55 22 22 11 22 11 22 22 11 ZS0123111 0 22 22 22 11 11 22 11 22 ZS0560 33 55 22 22 11 22 11 22 22 11Inbred and Hybrid Performance of G5205

The traits and characteristics of inbred corn line G5205 are listed tocompare with other inbreds and/or in hybrid combinations. The G5205 datashows the characteristics and traits of importance, giving a snapshot ofG5205 in these specific environments.

Table 3A shows a comparison between G5205 and a comparable inbred G3601.G5205 has significantly higher yield at harvest and significantly moremoisture than does G3601. The present invention shows better emergenceand earlier Heat Peek. The two inbreds show significant differences inear height. The two inbreds differ significantly across all Heatmeasurements for pollen shed. Inbred G5205 shows better shed than doesG3601.

TABLE 3A PAIRED INBRED COMPARISON DATA Plant Heat Inbreds Yield MoistureEar Height Height Emerge Peek G5205 107.2  14.9 62.7 172.8 85.6 1411.1G3601 98.3 12.3 73.7 176.7 82.0 1433.0 # Expts 27.0 27.0 15.0 15.0 26.0 24.0 Diff  9.0  2.6 11.0 3.9  3.5  21.8 Prob 0.002*** 0.000*** 0.000***0.1 0.061* 0.015** Inbreds Heatp10 Heatp50 Heatp90 Heats10 Heats50Heats90 G5205 1444.9 1480.8 1614.3 1477.1 1514.0 1531.9 G3601 1463.31502.6 1664.5 1464.1 1505.1 1524.6 # Expts  25.0  25.0  14.0 25.0 25.014.0 Diff  18.4  21.8  50.2 13.0 8.9 7.3 Prob 0.016** 0.009*** 0.001***0.1 0.3 0.5 % Lrg % Lrg % Lrg % Sml Med % Sml Med Inbreds Med Flat MedRnd Plateless Flat Rnd G5205 36.1 15.6  5.7 18.7 12.0 G3601 22.0 38.212.6  4.2 17.2 # Expts 27.0 27.0 27.0 27.0 27.0 Diff 14.1 22.6  6.9 14.6 5.2 Prob 0.000*** 0.000*** 0.000*** 0.000*** 0.000*** % Sml InbredsPlateless % Cull Shed Cold Germ Warm Germ G5205 6.9 4.8 3.3 93.0 97.103601 3.0 2.6 2.9 92.9 96.5 # Expts 27.0  27.0  24.0  13.0 13.0 Diff 3.92.2 0.5 0.2 0.6 Prob 0.000*** 0.000*** 0.038** 0.9 0.5 *.05 < Prob <=.10 **.01 < Prob <= .05 ***.00 < Prob <= .01

TABLE 3A1 PAIRED INBRED COMPARISON DATA Plant Heat Inbred Yield MoistureEar Height Height Emerge Peek G5205 101.7  15.5 64.4 171.9 86.6 1408.1ZS0560 68.6 12.1 68.9 162.0 81.8 1406.6 # Expts 20.0 20.0 11.0  11.012.0 11.0 Diff 33.1  3.5  4.5  9.9 4.8 1.4 Prob 0.000*** 0.000*** 0.087*0.019** 0.1 0.9 Inbred Heatp10 Heatp50 Heatp90 Heats10 Heats50 Heats90G5205 1438.9 1477.9 1639.6 1474.9 1511.8 1559.4 ZS0560 1492.1 1529.21720.6 1494.0 1541.0 1578.4 # Expts  12.0  12.0  11.0  12.0  12.0  11.0Diff  53.1  51.3  81.1  19.1  29.2  19.1 Prob 0.000*** 0.001*** 0.000***0.058* 0.009*** 0.035** % Lrg % Lrg % Lrg % Sml Med % Sml Med Inbred MedFlat Med Rnd Plateless Flat Rnd G5205 35.4 14.6 4.6 20.5 12.0 ZS056014.4 32.1 4.1  6.5 30.0 # Expts 19.0 19.0 19.0 19.0 19.0 Diff 21.0 17.50.5 14.0 17.9 Prob 0.000*** 0.000*** 0.6 0.000*** 0.000*** % Sml InbredPlateless % Cull Shed Cold Germ Warm Germ G5205 7.3 5.4 3.3 91.5 96.5ZS0560 8.0 4.9 2.8 93.4 96.6 # Expts 19.0 19.0 13.0  10.0 10.0 Diff 0.70.5 0.5 2.0 0.1 Prob 0.3 0.4 0.008*** 0.5 0.9 *.05 < Prob <= .10 **.01 <Prob <= .05 ***.00 < Prob <= .01

Table 3A1 shows a comparison between G5205 and its parent inbred ZS0560.G5205 has significantly higher yield at harvest and significantly moremoisture than does ZS0560. The present invention shows similar emergenceand Heat Peek. The two inbreds show significant differences in ear andplant height. The two inbreds differ significantly across all Heatmeasurements for pollen shed and silking. Inbred G5205 shows better shedrating than does ZS0560.

TABLE 3B PAIRED HYBRID COMPARISON DATA % Root % Stalk % Drop Test HybridYield FI GI Y M Moisture Lodge Lodge ear Weight G5205/CI 187.0 139.4189.7 8.8 21.7 1.4 2.9 0.0 56.5 8288* 190.8 145.2 193.3 9.5 20.7 0.7 1.90.1 57.0 # Expts 271 263 263 271 271 264 265 263 257 Diff 3.8 5.8 3.50.6 1.0 0.8 1.1 0.0 0.5 Prob 0.013** 0.000*** 0.000*** 0.000*** 0.000***0.018** 0.003*** 0.3 0.000*** *CI = common inbred in each hybrid

Table 3B shows the inbred G5205 in hybrid combination in comparison withanother hybrid combination, which has a common inbred with the hybridcontaining G5205. When in this hybrid combination the present inbredG5205 carries a significantly less yield and a shows significantincrease in lodging scores. The Y/M for the hybrid combinationcontaining the present invention is significantly different to thecompared hybrid.

TABLE 3B1 PAIRED HYBRID COMPARISON DATA % Root % Stalk Test Hybrid YieldFI GI Y M Moisture Lodge Lodge % drop ear Weight G5205 187.4 139.4 189.88.8 21.7 1.6 2.9 0.0 56.6 hybrid 8348 182.4 143.9 188.3 9.8 19.2 1.1 2.30.0 56.6 # Expts 271 262 262 271 271 263 265 262 256 Diff 5.1 4.5 1.51.0 2.6 0.6 0.6 0.0 0.0 Prob 0.002*** 0.000*** 0.1 0.000*** 0.000*** 0.10.1 0.5 0.9

Table 3B1 shows the inbred G5205 in hybrid combination in comparisonwith another hybrid combination, which is marketed in similarterritories. When in this hybrid combination the present inbred G5205carries into the hybrid significantly more moisture but alsosignificantly more yield. The Y/M for the hybrid combination containingthe present invention is significantly different to the compared hybrid.

Table 4 shows the GCA (general combining ability) estimates of G5205compared with the GCA estimates of the other inbreds. The estimates showthe general combining ability is weighted by the number ofexperiment/location combinations in which the specific hybridcombination occurs. The interpretation of the data for all traits isthat a positive comparison is a practical advantage. A negativecomparison is a practical disadvantage. The general combining ability ofan inbred is clearly evidenced by the results of the general combiningability estimates. This data compares the inbred parent in a number ofhybrid combinations to a group of “checks”. The check data is from othercompanies' hybrids, particularly the leader in the industry and GarstSeed's commercial products and pre-commercial hybrids, which were grownin the same sets and locations. This Table shows that 124 differentcrosses were analyzed. Each of these crosses were made in small plotswith not less than 50 hybrid seeds being planted per cross. Theseexperiments produced progeny of G5205 by a number of different lines.The grain produced by these hybrids have the present invention as anancestor. The hybrid grain would be genetically different from thehybrid seed that formed the plant on which the hybrid grain wasproduced. However, such grain would be readily identifiable as beingprogeny of the invention or as having the invention as an ancestor.

TABLE 4 G5205 One parent in each hybrid tested to provide this N in N indata is YR YR N in Total G5205 1 2 YR 3 N FI Y M GI I YLD MST % SL % RL% DE TWT POP XR = 243 314 879 1454 −5.5 −0.8 −2.5 −2 −2.1 −1.3 −0.6 −1.10 −0.2 −73 116 XH = 243 314 879 124 −6.7 −0.9 −3.5 −3.2 −4.4 −1.4 −0.6−1.1 0 −0.4 −96 115 XT = 243 314 879 14 −3.5 −0.6 −1.2 −0.7 0.2 −1 −0.7−0.7 0 0.1 −55 115 XR = GCA Estimate: Weighted by Experiment XH = GCAEstimate: Weighted by Parent2 XT = Same as XH but using only thoseparent2 with two years of data FI = 100 + 0.5 (Yld) − 2.3(MST) − 0.9(%SL) − 0.9(% RL) − 2.7(% DE) POP = plants per acre RM = The MinnesotaRelative Maturity

Table 4 shows G5205 in XR crossed to 124 different inbreds to formhybrid combinations. G5205 in hybrid combination in XT shows anadvantage for yield and an advantage for test weight. In XH, XT and XRG5205 in hybrid combination RM's that are 116 or 115 when compared tothe commercial checks and the company's other inbreds in hybridcombination.

TABLE 5A YIELD RESPONSE Research Plots YIELD HYBRID Environment YieldHybrid Error # Plots 75 100 125 150 175 200 G5205 hybrid 18.4 158 78 103128 153 178 203 8288 15.7 5317 77 103 130 157 184 211 8348 18 5092 77102 128 154 179 205

TABLE 5B YIELD RESPONSE STRIP TESTS YIELD HYBRID Environment YieldHybrid Error # Strips 75 100 125 150 175 200 G5205 hybrid 13.3 83 72 97122 147 172 197 8288 13 2008 73 99 126 153 179 206 8348 13.6 1269 71 97124 150 177 203

Table 5A shows the research plot yield response of G5205 in hybridcombination in comparison with the plants in the environment around itat the same location and in comparison to two other hybrids. The datafor the present inbred is showing consistently higher results incomparison to the environment level. G5205 in hybrid combination andeach of the comparison hybrids, are exceeding the yield expectations inall environments. This inbred in plots is a workhorse hybrid that yieldsat levels which exceed the environment yields by about 3 bushels. Table5B shows the data from strip tests for the hybrid with the presentinbred and two comparison hybrids. These comparison hybrids are yieldinghigher than the environment except in the low yielding environment. Inthese tests the present invention in this hybrid combination is showing3 bushel less yield than the environment.

TABLE 6A Agronomic Traits G5205 hybrid vs 8288 YEAR # Early Stand AdvEmg Adv Vigor Adv S50 Adv P50 Adv Ear Ht. Adv 1  4 96.7 2.7 6.5 0.9 6.81.0 87.0 6.0 86.0 4.0 60.0 6.0  4 94.0 5.6 5.8 81.0 82.0 54.0 2 19 84.3−1.2 6.2 0.4 6.0 0.8 73.0 2.0 71.0 0.0 49.4 −0.1 19 85.5 5.7 5.1 71.070.0 49.5 3 17 86.3 6.8 5.1 0.3 5.6 0.5 72.0 2.0 71.0 1.0 46.3 0.7 1779.5 4.8 5.1 71.0 70.0 45.7 overall 40 85.8 3.0 5.7 0.4 5.9 0.7 74.0 2.072.0 1.0 49.5 0.7 40 82.8 5.3 5.2 72.0 71.0 48.8 YEAR # Plant Ht. AdvStay Green Adv Black Layer Adv Plant Int Adv 1  4 132.0 6.0 3.0 2.0 8.02.0  4 126.0 1.0 6.0 2 19 110.0 0.6 3.8 −0.3 119.0 −2.0 4.3 −0.5 19109.3 4.1 121.0 4.8 3 17 102.5 −0.2 4.0 −0.3 127.0 5.0 3.8 −1.0 17 102.74.3 122.0 5.0 overall 40 109.9 0.9 3.8 0.0 122.0 0.0 4.7 −0.4 40 109.03.8 121.0 5.1 Lines marked with the advantage information have data fromthe present inbred in hybrid combination ADV = ADVANTAGE

TABLE 6A1 G5205 hybrid vs 8348 YEAR # Early Stand Adv Emg Adv Vigor AdvS50 Adv P50 Adv Ear Ht. Adv 1 4 96.7 0.0 6.5 1.0 6.8 0.8 87.0 3.0 86.02.0 60.0 12.0 4 96.7 5.5 6.0 84.0 84.0 48.0 2 18 84.3 −1.4 6.4 0.3 6.00.3 73.0 2.0 71.0 2.0 49.4 3.1 18 85.7 6.2 5.6 71.0 69.0 46.3 3 17 86.32.4 5.1 0.0 5.6 0.2 72.0 1.0 71.0 0.0 46.3 0.3 17 83.9 5.1 5.4 71.0 71.046.0 overall 39 85.8 0.5 5.8 0.2 5.9 0.3 74.0 2.0 72.0 1.0 49.5 3.2 3985.2 5.6 5.5 72.0 71.0 46.4 YEAR # Plant Ht. Adv Stay Green Adv BlackLayer Adv Plant Int Adv 1 4 132.0 20.0 3.0 −1.0 8.0 1.5 4 112.0 4.0 6.52 18 110.0 8.8 3.8 −2.0 119.0 −2.0 4.3 −0.9 18 101.2 5.4 121.0 5.2 3 17102.5 6.5 4.0 −2.0 127.0 4.0 3.8 −1.0 17 96.0 5.8 123.0 5.0 overall 39109.9 9.2 3.8 −2.0 122.0 0.0 4.7 −0.6 39 100.7 5.4 122.0 5.3

The data in Table 6A and 6A1 shows the advantage or disadvantageassociated with the agronomic traits of the present inbred when inhybrid combination when compared with a commercial. The Table also showsa commercial hybrid that has one inbred in common with the hybrid thatincludes the present invention. The last two lines of data show thecombined data of all years. The present invention when in hybridcombination in the overall data shows a positive advantage for earlystand, emergence, and vigor in most years. The foregoing is set forth byway of example and is not intended to limit the scope of the invention.

This invention also is directed to methods for producing a corn plant bycrossing a first parent corn plant with a second parent corn plantwherein the first or second parent corn plant is an inbred corn plantfrom the line G5205. Further, both first and second parent corn plantscan come from the inbred corn line G5205 which produces a self of theinbred invention. The present invention can be employed in a variety ofbreeding methods which can be selected depending on the mode ofreproduction, the trait, and the condition of the germplasm. Thus, anybreeding methods using the inbred corn line G5205 are part of thisinvention: selfing, backcrosses, hybrid production, crosses topopulations, haploid by such old and known methods of using stockmaterial that induces haploids and anther culturing and the like.

All plants and plant cells produced using inbred corn line G5205 arewithin the scope of this invention. The invention encompasses the inbredcorn line used in crosses with other, different, corn inbreds to produce(F1) corn hybrid seeds and hybrid plants and the grain produced on thehybrid plant. This invention includes plant and plant cells, which upongrowth and differentiation produce corn plants having the physiologicaland morphological characteristics of the inbred line G5205.

Additionally, this maize can, within the scope of the invention,contain: a mutant gene such as, but not limited to, the sugary 1 orshrunken 1 or waxy or AE or imazethapyr tolerant (IT or IR™) mutantgene; or transgenic genes such as but not limited to insect resistantgenes such as Corn Rootworm gene, Bacillus thuringiensis (Cry genes), orherbicide resistant genes such as Pat gene or Bar gene, EPSP, or diseaseresistant genes such as the Mosaic virus resistant gene, etc., or traitaltering genes such as flowering genes, oil modifying genes, senescencegenes and the like. The methods and techniques for inserting, orproducing and/or identifying a mutation or a transgene into the presentinvention through breeding, transformation, or mutating are well knownand understood by those of ordinary skill in the art.

Various techniques for breeding and moving or altering genetic materialwithin or into the present invention (whether it is an inbred or inhybrid combination) are also known to those skilled in the art. Thesetechniques to list only a few are anther culturing, haploid production,(stock six is a method that has been in use for thirty years and is wellknown to those with skill in the art), transformation, irradiation toproduce mutations, chemical or biological mutation agents and a host ofother methods are within the scope of the invention. All parts of theG5205 plant including its plant cells produced using the inbred cornline are within the scope of this invention. The term transgenic plantrefers to plants having genetic sequences, which are introduced into thegenome of a plant by a transformation method and the progeny thereof.Transformation methods are means for integrating new genetic codingsequences into the plant's genome by the incorporation of thesesequences into a plant through man's assistance, but not by breedingpractices. The transgene once introduced into plant material andintegrated stably can be moved into other germplasm by standard breedingpractices.

Though there are a large number of known methods to transform plants,certain types of plants are more amenable to transformation than areothers. Transformation of dicots is usually achievable for example,tobacco is a readily transformable plant. Monocots can present sometransformation challenges, however, the basic steps of transformingplants monocots have been known in the art for about 15 years. The mostcommon method of maize transformation is referred to as gunning ormicroprojectile bombardment though other methods can be used. Theprocess employs small gold-coated particles coated with DNA which areshot into the transformable material. Detailed techniques for gunningDNA into cells, tissue, callus, embryos, and the like are well known inthe prior art. One example of steps that can be involved in monocottransformation are concisely outlined in U.S. Pat. No. 5,484,956“Fertile Transgenic Zea mays Plants Comprising Heterologous DNA EncodingBacillus Thuringiensis Endotoxin” issued Jan. 16, 1996 and also in U.S.Pat. No. 5,489,520 “Process of Producing Fertile Zea mays Plants andProgeny Comprising a Gene Encoding Phosphinothricin Acetyl Transferase”issued Feb. 6, 1996.

Plant cells such as maize can be transformed not only by the use of agunning device but also by a number of different techniques. Some ofthese techniques include maize pollen transformation (See University ofToledo 1993 U.S. Pat. No. 5,177,010); Whiskers technology (See U.S. Pat.Nos. 5,464,765 and 5,302,523); electroporation; PEG on Maize;Agrobacterium (See 1996 article on transformation of maize cells inNature Biotechnology, Volume 14, June 1996) along with numerous othermethods which may have slightly lower efficiency rates. Some of thesemethods require specific types of cells and other methods can bepracticed on any number of cell types.

The use of pollen, cotyledons, zygotic embryos, meristems and ovum asthe target issue can eliminate the need for extensive tissue culturework. Generally, cells derived from meristematic tissue are useful. Themethod of transformation of meristematic cells of cereal is taught inthe PCT application WO96/04392. Any number of various cell lines,tissues, calli and plant parts can and have been transformed by thosehaving knowledge in the art. Methods of preparing callus or protoplastsfrom various plants are well known in the art and specific methods aredetailed in patents and references used by those skilled in the art.Cultures can be initiated from most of the above-identified tissue. Theonly true requirement of the transforming plant material is that it canform a transformed plant.

The DNA used for transformation of these plants clearly may be circular,linear, and double or single stranded. Usually, the DNA is in the formof a plasmid. The plasmid usually contains regulatory and/or targetingsequences which assists the expression of the gene in the plant. Themethods of forming plasmids for transformation are known in the art.Plasmid components can include such items as: leader sequences, transitpolypeptides, promoters, terminators, genes, introns, marker genes, etc.The structures of the gene orientations can be sense, antisense, partialantisense, or partial sense: multiple gene copies can be used. Thetransgenic gene can come from various non-plant genes (such as;bacteria, yeast, animals, and viruses) along with being from plants.

The regulatory promoters employed can be constitutive such as CaMv35S(usually for dicots) and polyubiquitin for monocots or tissue specificpromoters such as CAB promoters, MR7 described in U.S. Pat. No.5,837,848, etc. The prior art promoters, includes but is not limited to,octopine synthase, nopaline synthase, CaMv19S, mannopine synthase. Theseregulatory sequences can be combined with introns, terminators,enhancers, leader sequences and the like in the material used fortransformation.

The isolated DNA is then transformed into the plant. After thetransformation of the plant material is complete, the next step isidentifying the cells or material, which has been transformed. In somecases, a screenable marker is employed such as the beta-glucuronidasegene of the uidA locus of E. coli. Then, the transformed cellsexpressing the colored protein are selected. In many cases, a selectablemarker identifies the transformed material. The putatively transformedmaterial is exposed to a toxic agent at varying concentrations. Thecells not transformed with the selectable marker, which providesresistance to this toxic agent, die. Cells or tissues containing theresistant selectable marker generally proliferate. It has been notedthat although selectable markers protect the cells from some of thetoxic affects of the herbicide or antibiotic, the cells may still beslightly affected by the toxic agent by having slower growth rates. Ifthe transformed material was cell lines then these lines are regeneratedinto plants. The cells' lines are treated to induce tissuedifferentiation. Methods of regeneration of cellular maize material arewell known in the art.

A deposit of at least 2500 seeds of this invention will be maintained bySyngenta Seeds, Inc., 2369 330th Street, Slater, Iowa 50244. Access tothis deposit will be available during the pendency of this applicationto the Commissioner of Patents and Trademarks and persons determined bythe Commissioner to be entitled thereto upon request. All restrictionson availability to the public of such material will be removed uponissuance of a granted patent of this application by depositing at least2500 seeds of this invention at the American Type Culture Collection(ATCC), at 10801 University Boulevard, Manassas, Va. 20110. The date ofdeposit was Apr. 18, 2008. The ATCC number of the deposit is PTA-9163and on May 9, 2008 the deposit was found viable when tested. The depositof at least 2500 seeds will be from the same inbred seed taken from thedeposit maintained by Syngenta Seeds, Inc. The ATCC deposit will bemaintained in that depository, which is a public depository, for aperiod of 30 years, or 5 years after the last request, or for theenforceable life of the patent, whichever is longer, and will bereplaced if it becomes nonviable during that period.

Additional public information on some ZS designations may be availablefrom the PVP Office, a division of the U.S. Government.

Accordingly, the present invention has been described with some degreeof particularity directed to the preferred embodiment of the presentinvention. It should be appreciated, though, that the present inventionis defined by the following claims construed in light of the prior artso that modifications or changes may be made to the preferred embodimentof the present invention without departing from the inventive conceptscontained herein.

1. A seed of corn inbred line designated G5205, representative seed ofsaid line having been deposited in the ATCC under accession numberPTA-9163.
 2. A corn plant produced by the seed of claim
 1. 3. A tissueculture of regenerable cells of the corn plant of claim 2, wherein thecells of the tissue culture regenerate plants that express all of thephysiological and morphological characteristics of inbred line G5205. 4.The tissue culture according to claim 3, wherein cells of the tissueculture are from plant part selected from the group consisting ofleaves, pollen, embryos, roots, root tips, meristem, ovule, anthers,silk, flowers, kernels, ears, cobs, husks and stalks.
 5. A corn plantregenerated from the tissue culture of claim 3, wherein the plant hasall of the physiological and morphological characteristics of a plant ofinbred line G5205, seed of said line having been deposited under ATCCaccession number PTA-9163.
 6. A hybrid seed produced by a methodcomprising the following steps: (a) planting seeds of corn inbred lineG5205, representative seed having been deposited in the ATCC underaccession number PTA-9163, and another inbred line, one of said inbredlines not releasing pollen; (b) allowing pollination of the non-pollenreleasing inbred to occur; and (c) harvesting seed produced on thenon-pollen releasing inbred.
 7. A hybrid seed produced by a methodcomprising crossing the plant of claim 2, with a corn plant of anotherinbred line and harvesting the resultant F1 hybrid corn seed.
 8. Ahybrid plant grown from the seed of claim
 7. 9. A tissue culture of theregenerable cells from the plant of claim
 8. 10. A first generation (F1)hybrid corn plant produced in a process comprising: (a) planting inpollinating proximity, seeds of corn inbred line G5205, representativeseed of said line having been deposited in the ATCC under accessionnumber PTA-9163, and another inbred line; (b) cultivating corn plantsresulting from said planting; (c) preventing pollen production by theplants of one of the inbred lines; (d) allowing naturalcross-pollination to occur between said inbred lines; (e) harvestingseed produced on plants of the inbred line in which pollen productionwas prevented; and (f) growing a harvested seed of step (e).
 11. Atissue culture of regenerable cells from the plant of claim
 10. 12.Pollen of the corn plant produced by the seed of claim
 1. 13. A cornplant that expresses all of the physiological and morphologicalcharacteristics of corn inbred line G5205, seed of said line having beendeposited under ATCC accession number PTA-9163.
 14. A method ofintroducing a transgene into corn inbred line G5205, the methodcomprising transforming a plant of corn inbred line G5205 with atransgene.
 15. A plant produced according to the method of claim
 14. 16.A seed produced from the plant of claim
 12. 17. The seed of claim 16,wherein said seed is a hybrid.
 18. The method of claim 14, wherein thetransgene confers herbicide resistance.
 19. An herbicide resistant cornplant produced by the method of claim
 18. 20. The corn plant of claim19, wherein the transgene encodes phosphinothricin synthase or EPSPS.21. The method of claim 14, wherein the transgene confers insectresistance.
 22. An insect resistant corn plant produced by the method ofclaim
 21. 23. The corn plant of claim 22, wherein the transgene encodesa Bacillus thuringiensis endotoxin.
 24. The method of claim 14, whereinthe transgene confers disease resistance.
 25. A disease resistant cornplant produced by the method of claim 24.